Posted 02 February 2013 - 06:18 AM

Posted 02 February 2013 - 09:21 AM

mitch_de

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Yep, but small FPS diffs can happen between different CPu /Bus / PCIe speeds and different clocked (GPU/VRAM) speeds to.Even on same system speed diffs between two runs can happen - in area of 400 FPS at least 10-20 fps diff between runs is normal.

Perhaps the OpenCLbandwidth test may help to find out such speed diffs (CPU<>GPU data transferspeed, GPU<>GPU(=devicetodevice) speeds)

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Posted 03 February 2013 - 03:59 AM

TH3L4UGH1NGM4N

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Very much true that there will always be slight differences when having same gpu with different cpu/bus/pci speeds etc but looking at his system with an i5 paired with the 7870, I'd only assume that my cpu overclock has to do with the higher fps from the gpu (just an assumption I'll test with stock clock settings to verify).

And thank you mitch_de the test proves quite interesting to see those differences in bandwidth. The last one involving the vram speed was the most interesting for me to see as I've never seen the actual speeds in any tests before.

I might pick at the other guy to run the test as well so I could see how the numbers look on his end.

Posted 04 February 2013 - 10:52 AM

mitch_de

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And why i get only 485fps with my GTX680

Hmmm, does show OpenCL bandwith test some bottleneck compared to similar cpu/gpu systems?But i heared that, also Luxmark (OpenCL) speed of some GTX 6xx ( i dont remember which) was much worse than older GTX 5xx card.Maybe it was the GTX 680 which si fast OpenGL card but way slower than possible in CUDA/OpenCL because some internal design changesto get more FPS out in OpenGL in cost of much less OpenCL / Shader speed ?